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    Question

    If the third proportion of 18 and 15 is тАЬ0.4mтАЭ, then

    find the value of (m тИТ 10) : (m + 30).
    A 3:8 Correct Answer Incorrect Answer
    B 1:2 Correct Answer Incorrect Answer
    C 5:11 Correct Answer Incorrect Answer
    D 17 : 49 Correct Answer Incorrect Answer

    Solution

    Third proportion of two numbers тАШaтАЩ and тАШbтАЩ is (b┬▓/a). So, 0.4m = (15┬▓/18) = 12.5. Or, 'm' = 31.25. Required value = (31.25 - 10) : (31.25 + 30) = 21.25 : 61.25 = 17 : 49

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